Growth and Production of Red Onion (Allium ascalonicum L) Varieties Using NPK Fertilizer Doses at Ultisol Soil

Increasing red onion production is required to fulfill domestic market share requirements. One of the efforts that can be implemented is to use proper variety and NPK fertilizer application, especially on marginal land such as ultisol soil. The research objective is to determine the growth and production of several red onion varieties by applying NPK fertilizer in ultisol soil. This study used a factorial Group Randomized Design consisting of two treatments and three repeats. The first factor is red onion variety (V) covering V1: Bima Brebes Variety, V2: Tajuk (Thailand Nganjuk) Variety, V3: Sumenep Variety, V4: Bauji Variety and the second factor is NPK fertilizer (F) with doses of F1: 200kg/ha, F2: 250 kg/ha, F3: 300 kg/ha. The results showed that the treatment combination between Bima Brebes Variety and 250 kg/ha NPK fertilizer produces better growth and production than other treatments. The Bima Brebes variety showed better growth and production than other varieties. The application of 250 kg/ha NPK fertilizer, on average, produces the highest value in the growth and production of red onion.